Fascinating exchange today between Sen. Levin and Gen. Petraeus. It starts at 58:40 in this webcast. Levin asks if the July 2011 represents the general’s “best personal, professional judgment.” Then, a long pause ensues, before Petraeus says that “we have to be very careful with timelines.” In other words: No. No doubt the politicos at the White House will be outraged and on the phone to Jonathan Alter forthwith.